Possession (Su)

When a belier devil uses its magic jar spell-like
ability, it can identify and pinpoint life forces accurately,
allowing it to select its victims with ease. It does not require
a receptacle to use magic jar. If it uses magic jar on a host
while on the Material Plane, its own body becomes ethereal
for the duration of the possession and the magic jar effect
lasts until the effect is dispelled, the devil ends the effect, it
is forced out of its host body, or it or its host body is slain.

ECOLOGY

Environment any (Hell)Organization solitaryTreasure double

Masterful possessors and foul manipulators, belier devils
are among the most feared masterminds of Hell. Known
as bdellavritras to devilkind, these worm-like fiends avoid
physical confrontation. Instead, they target influential
individuals for possession, using them to manipulate
events by proxy. If their schemes are uncovered, the devils
retaliate with all the power at their host bodies’ disposal.

A bdellavritra’s voice can emanate from its worm-like
maw, from any of its human-like mouths, or from all four
at once, as it desires. Each mouth has its own distinct
voice, often pleasing to the human ear. Bdellavritras
typically reach lengths of 16 feet from
worm-mouth to human heads,
and weigh 3,000 pounds.